package com.sky.aspect;

import com.sky.annotation.Autofill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.Autofill)")
    public void autoFillPointCut() {
    }

    /*
     * 前置通知*/
        @Before("autoFillPointCut()")
        public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共子字段填充。。");
//获取拦截的方法
            MethodSignature signature = (MethodSignature) joinPoint.getSignature();
            Autofill autofill = signature.getMethod().getAnnotation(Autofill.class);
            OperationType operationType = autofill.value();


//        获取拦截的方法的参数-实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) return;
        Object entity = args[0];


//        准备赋值 的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
//        根据不同的操作类型,为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch ( Exception e) {
                throw new RuntimeException(e);
            }

        }

    }
}
